PHAROS lasers can be equipped with feedback electronics for carrier-envelope phase (CEP) stabilization of the output pulses. The carrier-envelope offset (CEO) of the PHAROS oscillator is actively locked to 1/4th of the repetition rate with a < 100 mrad standard deviation. The CEP-stable pulses from the synchronized amplifier feature a standard deviation of < 350 mrad. Any CEP drift occurring within the amplifier or the user’s setup can be compensated using an out-of-loop f-2f interferometer, included as part of the complete PHAROS active CEP stabilization package.